I'm not an expert on this topic. I started working out regularly and doing more strenuous exercises. But I was running out of energy and though that I should probably supplement with some protein because I don't have enough protein in my diet. I'm not the kind to eat a whole jug of cottage cheese every day. When I asked around for the best type of whey protein, everyone told me to get the isolate. They said it absorbs faster and works better than other types.
I started drinking whey protein isolate a few days ago and I'm definitely seeing a difference in my energy levels. I'm sure it's going to help me build muscle.